110 ME. GAKDIKER AND PROF. REYNOLDS OX THE [June 1914, 



In the eastern part of the Lough Nafooey area all the Silurian 

 rocks exposed have a southerly dip ; but, as one passes westwards, the 

 rocks along the southern border of the map are seen to be dipping 

 at a high angle to the north. The Silurian rocks are therefore 

 folded into a sharp s} r ncline (see fig. 2. below), the northern limb 

 of which forms the main outcrop of the Silurian rocks throughout 

 both the Kilbride and the Lough Naf ooey areas, while the southern 

 limb is seen only in the south-western part of the Lough Nafooey 

 area, and, as described in our Kilbride paper, 1 in the north-eastern 

 part of the Kilbride area. 



Fig. 2. — Section along the line AB in the map (PL XVTI). 



>N. 



West of Curraghrevagh Mountain 

 J1615 feet) 



g- F h K 



[Horizontal scale : 3 inches 



d 

 1 mile. 



a=Doon Rock Grits (Wenlock Series). 



b = Grey-green flags and purple sandy shales 



(Tarannon Series). 

 c = Calcareous Flags (Finny School Beds). ] Blan- 

 ch Annelid Grits. L do very 

 e =Red Sandstones. J Series. 



Glen.Trague 



Alluvium 



D b a D 



Vertical scale exaggerated.] 



/=Mweelrea Grits (Llandeilo Series). 



Cspilite. JArenig Series. 

 F=Felsite intrusion. 

 K=Bostonite intrusion. 

 D=Dolerite intrusions. 



The Silurian rocks may be subdivided almost precisely as in the 

 Kilbride area, namely : — 



6. Doon Bock Grits 



5 b. Grey -green flags 



5 a. Purple sandy shales 



4. Finny School Beds (Calcareous Flags) 



3. Annelid Grits 90 to 200 



2. Bed Sandstones 200 to 350 



1 . Basal Conglomerate to 25 



Tltiekues* in feet. 



875 seen. Wenlock. 



80 L Tarannon. 

 420 to 820 



Upper 

 ' Llandovery. 



A brief description of these beds will suffice : — 



(1) The Basal Conglomerate. — -Owing probably to imper- 

 fection of exposures, we have seen this rock only in the extreme 

 western part of the area — principally in the beds of the two 

 westerly streams which descend from the cirque north of Benbeg, 

 and flow down to Curraghrevagh village. In these streams are two 

 bands of conglomerate, the lower of which is about 25 feet thick. 

 The relations of the rocks here are rather puzzling, and we describe 

 them in greater detail (see p. 113) when dealing with the lime- 



Q.J. G.S. vol. lxviii (1912) p. 87. 



